Marcia has a swelled head; she thinks that she is the most gifted person in her class.
- keep one's head above water
- head start
- have a big head
- get into (someone's) head
- scream one's head off
- head for (someone or something)
- get it into one's head to (do something)
- stick one's head in a noose
- off the top of one's head
- bury/hide one's head in the sand
- head off (something)
- head and shoulders above (someone or something)
- Heads up!